<blockquote id="j040y"><pre id="j040y"></pre></blockquote>

');\n doc.body.appendChild(document.querySelector('#divKanZhengPanel-binli').cloneNode(true));\n doc.write('<\/script><\/pre>"}

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Solve the problem of not updating JavaScript form print content
Home Web Front-end HTML Tutorial Why does some modified content not take effect when printing forms using JavaScript?

Why does some modified content not take effect when printing forms using JavaScript?

Apr 04, 2025 pm 10:30 PM
css Why

Why does some modified content not take effect when printing forms using JavaScript?

Solve the problem of not updating JavaScript form print content

When printing web forms using JavaScript, you sometimes find that the user's modified content is not reflected in the print preview. This is because getting form HTML directly (for example using .prop("outerHTML") ) cannot capture real-time user input. For example, the text box content or check box status may not be correctly reflected.

The problem is that directly obtaining HTML cannot update dynamically modified content in real time. To solve this problem, you need to use the cloneNode(true) method to clone the form node, ensuring that the cloned node contains all the latest user input and state changes.

Here is an improved code example that demonstrates how to solve this problem using cloneNode(true) :

<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<div id="divKanZhengPanel-binli">
    <div>
        <div class="checkDiv">
            <label>Right position</label>
            <label>External slant</label>
            <label>Inner slant</label>
            <label>Outer hidden oblique</label>
            <label>Implicit oblique</label>
        </div>
    </div>
</div>
<button id="dw">Click me to print</button>

<script>
    document.getElementById('dw').addEventListener('click', function() {
        $('#print-iframe').remove(); // 清除之前的iframe
        let iframe = document.createElement('iframe');
        iframe.id = 'print-iframe';
        iframe.style.cssText = 'position:absolute;width:0px;height:0px;left:-0px;top:-0px;visibility:hidden;';
        document.body.appendChild(iframe);

        let doc = iframe.contentWindow.document;
        doc.open();
        doc.write('<html><head><title>打印預(yù)覽<body>');
        doc.body.appendChild(document.querySelector('#divKanZhengPanel-binli').cloneNode(true));
        doc.write('</script>

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